Conjuring up twins best ways ???

I’m really interested in having twins one day , my family have sets of twins on both sides , my 1st cousin came from my aunt she had some which is my Grand mother first grand sons (twins) and I’m the only grand girl by her son .Gramdma only had 2 girls an 1 boy her other daughter 2nd aunt doesn’t have none children. Then my other side family 2nd grandmother in her siblings of 12 their is a set of twins her brother an sister which happens to be my great aunt and uncle who is 10 years younger then Gramdmother and their babies of the pack from her brothers and sisters. (Any suggestions that are more likely to conjure twins especially if it close to gene pool of both families *can their be more closer way of producing them ) , best methods, foods, ideas etc ... all are welcome and helpful in long run